1 /* ===-- int_lib.h - configuration header for compiler-rt -----------------===
2 *
3 * The LLVM Compiler Infrastructure
4 *
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
7 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file is a configuration header for compiler-rt.
11 * This file is not part of the interface of this library.
12 *
13 * ===----------------------------------------------------------------------===
14 */
15
16 /*
17 * Portions copyright (c) 2017, ARM Limited and Contributors.
18 * All rights reserved.
19 */
20
21 #ifndef INT_LIB_H
22 #define INT_LIB_H
23
24 /* Assumption: Signed integral is 2's complement. */
25 /* Assumption: Right shift of signed negative is arithmetic shift. */
26 /* Assumption: Endianness is little or big (not mixed). */
27
28 #if defined(__ELF__)
29 #define FNALIAS(alias_name, original_name) \
30 void alias_name() __attribute__((alias(#original_name)))
31 #else
32 #define FNALIAS(alias, name) _Pragma("GCC error(\"alias unsupported on this file format\")")
33 #endif
34
35 /* ABI macro definitions */
36
37 #if __ARM_EABI__
38 # define ARM_EABI_FNALIAS(aeabi_name, name) \
39 void __aeabi_##aeabi_name() __attribute__((alias("__" #name)));
40 # ifdef COMPILER_RT_ARMHF_TARGET
41 # define COMPILER_RT_ABI
42 # else
43 # define COMPILER_RT_ABI __attribute__((pcs("aapcs")))
44 # endif
45 #else
46 # define ARM_EABI_FNALIAS(aeabi_name, name)
47 # define COMPILER_RT_ABI
48 #endif
49
50 #ifdef _MSC_VER
51 #define ALWAYS_INLINE __forceinline
52 #define NOINLINE __declspec(noinline)
53 #define NORETURN __declspec(noreturn)
54 #define UNUSED
55 #else
56 #define ALWAYS_INLINE __attribute__((always_inline))
57 #define NOINLINE __attribute__((noinline))
58 #define NORETURN __attribute__((noreturn))
59 #define UNUSED __attribute__((unused))
60 #endif
61
62 /*
63 * Kernel and boot environment can't use normal headers,
64 * so use the equivalent system headers.
65 */
66 # include <sys/limits.h>
67 # include <sys/stdint.h>
68 # include <sys/types.h>
69
70 /* Include the commonly used internal type definitions. */
71 #include "int_types.h"
72
73 COMPILER_RT_ABI si_int __paritysi2(si_int a);
74 COMPILER_RT_ABI si_int __paritydi2(di_int a);
75
76 COMPILER_RT_ABI di_int __divdi3(di_int a, di_int b);
77 COMPILER_RT_ABI si_int __divsi3(si_int a, si_int b);
78 COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d);
79
80 COMPILER_RT_ABI su_int __udivmodsi4(su_int a, su_int b, su_int* rem);
81 COMPILER_RT_ABI du_int __udivmoddi4(du_int a, du_int b, du_int* rem);
82 #ifdef CRT_HAS_128BIT
83 COMPILER_RT_ABI si_int __clzti2(ti_int a);
84 COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem);
85 #endif
86
87 /* Definitions for builtins unavailable on MSVC */
88 #if defined(_MSC_VER) && !defined(__clang__)
89 #include <intrin.h>
90
__builtin_ctz(uint32_t value)91 uint32_t __inline __builtin_ctz(uint32_t value) {
92 unsigned long trailing_zero = 0;
93 if (_BitScanForward(&trailing_zero, value))
94 return trailing_zero;
95 return 32;
96 }
97
__builtin_clz(uint32_t value)98 uint32_t __inline __builtin_clz(uint32_t value) {
99 unsigned long leading_zero = 0;
100 if (_BitScanReverse(&leading_zero, value))
101 return 31 - leading_zero;
102 return 32;
103 }
104
105 #if defined(_M_ARM) || defined(_M_X64)
__builtin_clzll(uint64_t value)106 uint32_t __inline __builtin_clzll(uint64_t value) {
107 unsigned long leading_zero = 0;
108 if (_BitScanReverse64(&leading_zero, value))
109 return 63 - leading_zero;
110 return 64;
111 }
112 #else
__builtin_clzll(uint64_t value)113 uint32_t __inline __builtin_clzll(uint64_t value) {
114 if (value == 0)
115 return 64;
116 uint32_t msh = (uint32_t)(value >> 32);
117 uint32_t lsh = (uint32_t)(value & 0xFFFFFFFF);
118 if (msh != 0)
119 return __builtin_clz(msh);
120 return 32 + __builtin_clz(lsh);
121 }
122 #endif
123
124 #define __builtin_clzl __builtin_clzll
125 #endif /* defined(_MSC_VER) && !defined(__clang__) */
126
127 #endif /* INT_LIB_H */
128